I don't have any personal experience with either company but I have friends who have bought from Cyberpower, and boy, was the work shoddy. Fans weren't connected, temperature gauges were in sub-optimum positions, and the case had a few missing screws so I'd stay away from those. I took a quick look over on Amazon at Ibuypower's wares and I have to say, building your own is really the most cost-effective way. I know you don't feel confident doing the work, so I am not suggesting you do, but maybe you have a friend who would do it for you. I build my friends stuff.

If that's the case, I have a fairly decent build set up on an Amazon wishlsit. It's about $1,700 right now if I recall, but that includes an HD monitor, sound system, and gaming keyboard/mouse. In fact, if you cut it down to purely performance based parts, and get rid of my fancy soundcard I would use for recording, it would probably hover in the $1,300 range.